body {
  // 触摸时不做任何动作
  touch-action: none;
  // 禁止在子元素实现下拉刷新
  overscroll-behavior-y: contain;
}
.box {
  width: 2rem;
  height: 2rem;
  background-color: red;
  position: absolute;
  top: 0;
  left: 0;
}
